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Post by maddog2020 on Apr 12, 2009 20:07:33 GMT -5
Hello...I'm new here..and very impressed with the sight!! I have recently aquired a Mark III and I need this thing set up for a unamplified mic. Do I remove the resistor and install a wire in it's place ? It also appears that this radio had a 4 pin connector in it before...Anybody know how this is supposed to be wired to be stock?The modulation is pinchy.trebely..no bass... I've tried different mic heads and then one mic head I knew was a good one with the same results...
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Post by maddog2020 on Apr 12, 2009 20:14:18 GMT -5
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Post by Tombstone (R.I.P.) on Apr 12, 2009 21:35:17 GMT -5
I have two schematics for the Mark III ssb transmitter. One might be the early production model, one might be the late. I don't know if you want to go back to the original two pin connector in the radio but as long as you use the same pins on a four pin it will be the same. Both schematics show the shell of the connector being ground and from what I can see in your picture that is probably where the red wire with the black stripe goes. Pin one has the resistor so you need that. Pin 2, which looks like your yellow wire, runs to R62 22K 10 watt. On the other schematic it runs to what looks like an inductor or choke in series with R62 15K 4 watt? At any rate you pic looks like the connector is wired correctly, just solder what looks like that red and black ground wire back onto the shell of the mic jack. If your audio is still mostly all treble then check the mic audio pot on the chassis, you need it turned almost fully clock wise for an unamplified mic, which the radio was designed for and check you modulation tube 6BQ5. This should put you in the ball park as long as the resistor and the yellow wire are connected to the correct pins on the mic jack. There still might be other problems, good luck.
Tombstone
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Post by maddog2020 on Apr 13, 2009 12:40:25 GMT -5
Thanks Tombstone! This is another one of those e-crap radio's that was advertised as in excellent looking and working condition. The radio was bought by a friend of mine up in Mi. He is also new to the forum and goes by browningboy31.. If a tech would of purchsed the radio...it would probaly be a easy fix....but after paying what he paid for it.....it should of been in excellent working order as it was discribed in the auction...I remember talking on a Mark4 back in the late 70's....And with the right set up ...these radio's would make people wish they had one on the receiving end of the transmition.. Browningboy31 is naturally high in the air at his location as far as land elevation for damn good antenna height..(about 200 feet higher then neighboring towns ) and has the big coax and a good antenna that produces a good swr match... I sort of feel bad for steering him more to buying the browning verses a new base station that money wise.. would have been about the same amount he paid for the browning..But then again some people get lucky in buying stuff off of e-crap and some aren't so lucky. I've purchased three radios .two meters and a d-104 mic off off e-crap with no known issues with any of them.. So anyways ..I told browningboy we'll get if figured out ...I have a little electronics background but it's hard to tinker with it when it's 350 miles away..  |
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Post by Tombstone (R.I.P.) on Apr 13, 2009 17:05:58 GMT -5
That's a problem, when you can't actually get your hands on a radio it makes it difficult and confusing to troubleshoot.
Tombstone
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